HOW TO DO IT:
1.) Draw your cactus, gardening pot, and cactus blossom on your foam sheets, and then cut them out. I just free-handed it.

2.) Use your craft paper to embellish the elements of your choice, and fix them to the foam with Mod Podge. Brush the surface of the craft paper with Mod Podge to get a nice sheen, if desired.

3.) Once dry, start assembling your cactus, using tape. Then, roll tape or use double-sided tape to mount the cactus on your backing (construction paper, or whatever backing you’ve decided to use). I actually like the way rolling the tape makes the cactus look more dimensional, once framed.